The Omnipure (Q5621-P) is a 10 Micron Carbon Block Water Filter with Phosphate Scale Inhibitor. This filter features the optional Twist Tap in-head valve system, which automatically turns the supply water off when the body is disconnected from the head.This filter aids in the removal of scale, taste, odor and chlorine taste and odor. Additional Details ------------------------------ Product description: The Omnipure (Q5621-P) is a 10 Micron Carbon Block Water Filter with Phosphate Scale Inhibitor. This filter features the optional Twist Tap in-head valve system, which automatically turns the supply water off when the body is disconnected from the head.This filter aids in the removal of scale, taste, odor and chlorine taste and odor.